Figure 7. Role of GmNAC004 in regulation of lateral root density of transgenic Arabidopsis plants.

(A) Transgenic Arabidopsis overexpressing GmNAC004 in response to ABA and 2,4-D treatments. Four-day-old seedlings of WT and GmNAC004 transgenic plants (T4 generation) were exposed to 5 µM ABA, 20 nM 2,4-D, 2 µM NPA or their combinations for 7 days. Control treatment was not treated with hormones. Error bars are the standard errors of the means from six replications. Asterisks denote significant differences at 95% between the WT and transgenic plants. (B) Expression of representative ABA and auxin signaling genes in transgenic GmNAC003 and GmNAC004 Arabidopsis plants. Duncan multiple-mean comparisons were used and different letters indicates differences of the means.